Harry g



PATETED AUG. 25, 1908.

Nol 897,240.

Mmm .B n, MTB. SA MY. SD B n BEL WMM IHK GPm 'EA Hmm Tm l USTED sTATii-s Pif-@ENT onrion.

HAR RY G. WEBSTER, OF CHICAGO, ILLINOIS, ASSIGNOR T() MUM G. KELLOGG, UF UHU'MGU, ILLLOS.

TELEPHONE SYSTEM.

Specification of Renters Patent.

Patented Aug. 25, 1908.

Apniicmon :nea Haren 5, isos. serial No. 301.228.

To Il 'u fom it vmay concern.'

Be it known that I, HARRY G. WEBsTEu, e. citizen of the AUnited States, and resident oi Chicago, county of Cook, and Sta-2, of Illinois, have invented new and useful lxnproveniens in Telephone Systems, of which the following is a specification.

The present. invention relates lo manual tele iliona s vstemsgeneraily, and more partivumrlj; :o that type in which the varums telephone lines exending to the central oiiire are inductively, rather than conductively, united for conversaiion through the agency of repeating coils interposed between. the lines end their respective terminals.

The. principal ohjeL-L of the invention is to provide :i sinipiiied s xsiem of this type', which will he economical tn nmnufacture,

easy to install, and ellicient in operaion..

To t'hiseud, l employ a novel arrangement of Circuits :ind apparatus for controlling the line and supervisorx' signals, and Combine lie repeating coil and line relay a single structure.

The nature and objects of the invent-ion will more full); appear uponrefersnre to the following detailed description taken in connection with the accompanying drawings, and the svope of the invention vwill he part-icuhnly indicated in the appended claims.

lr. said drawing. Figure illustrntes`dia-- grumnmiienlly :i telephone system.Constituting one speeies of the present invent-ion, und Fg. 2 illustrates a portion ol' a similar dia-- groin constituting a second species of the invention.

Referring to .said drawing in detail, A foul B designate two snhsalions whirh ore. connected to z. eenrnl ollice *C hy suihihle telephone lines.

lhe equipment :at suhstnlxon A, whieh maj; he of on): preferred type, is here .shown as eoinprising :i mill-hell l in series with n condenser 2 ini-hailed in a .o ormfdlv rinsed bridge ol' ille telephone line lhnhs il --l hy ihn engagement. ol' @he switch-hook T with he contar-t. i5. A svrond hridg(- normally open,

iuvluding the trunsnziter 7 und oml whirling of the mdnetxon c'oxl S, is rlosml :il the conmet E) hy the suitvh-hooli whenever the rem-iwr l0, which is; inrhuh-d in :1 loud vir ruit with the other wi'mling of lhf.- induction coil is removed therefrom. 'lhe line circuit is' complet-ed al, the Central ollice through ,A polpntinl source of buttery eurreni 12 on: the winding 1l of the repeating coil l. The uinxiing l1 is .shown in two sections, one, of hi-:li is conneeled heween the line iil'uh 3 urz-.i the grounded pole of the buttery, ard the oier ofn'hirh is connected between the. line limb 4 und lhs. live pole of the. bott-ery. 'The nher winding 13 of the. repeating coil relay R is inclu led. in a brunch between the jacks Msnd ground. Both windings 1l and 13 anj wound upm the coro l5 of the relay, but are shown separated therefrom for elearness. The jaulas 14 are: also normally connected to ground through u brunch in purellel to the. wiiding 13 including lhe repeating coil relay contacts 16-17 and a resisiunf-e 18, here. shown .-:s an impedance. 'Ehe alternme Contact 1S of the relay, wherengaged, conne-sis the ,incl-:s 14 with the live pole or' a, low poienisi battery 1Q through the line an impedance.

The equipment and the connections thus lfar described vfih reference to su'ostvfdion A are duplicated in connection with subsi :dion B, and the corresponding parts nre there indicated by similar primed churacers.

Ai the central office, he jnrhs of different lines are adapted to be connected hy n linkcircuit comprising the strands 22-23 uniting the answering plug .54 and the calling plug 25. These strands are separated by the usual eomlenser 26, which will permit the passage of voire 'currents buf. plevent the passage in botti-.1y current.. Supervisory lumps 27 und 27', nach in series with an iinpedunee 2S-w2V, are connected between the live poli ofthiinitier-y l) and the link-circuit srands 22 und 23, respectively. The usual listening-luf.' 2E) is provided for vlosing u brunch from alie smind 23 lo ground through ihn vomir-user 'i'.. o aernlor's receiver 31', and the .secondary minding of an induction coil 32. The prima winding of the induction coil 32 is ineludod in i lorul circuit with the operav or's ronooitier 33 and the battery 34', while a erliury hiding of the induction coil is enum-12ml lwween the tip or fesing vonhietof the calling plug 25 :and ground. The sirznnl 23 is: also provided with u ringing-hey Iii whirl; normally engages :i fixed comme! I io inuiunin :he f-oninui) oi' Lne strand 23, hui whirl. :vor he depressed inio errug@- mcni with a {iM-d Contact 37 lo .sonneri the lau-.o 2U and a resistance '2i here shown also plu; 2.3

vln the oi illllll oesiriug to e enr. u

converse with .-t temores his reeeirer emi-.pierino the V.:-

l :intl thro pe;i1i. u. g ol this eu'- euit en ruin-"s the rel-1v ll sulueentlf to :itxruet, its :aromi or 'uitziet lli against. t-

sion or the opium sirringi v wim the lixerl contar?. 1W. ila. ing :l path ior eurrent through il 'lo to illuminate the. lutter, is :i signal to the operi-ttor tuut eoiineftion is :lesir line lump circuit extends tron; the lire pole of the huttetj.' l?, threaten impetluuee 21, liue lunipvl), relay eontziets 18u-lt?. repeating coil whirling 13, to ground. The flor.' of current through the lutter winding, honorer. is insullieient to cause the. return of the urine.- ture eoutuet 1G to its normal position. 'upon Observing the ull signal, the operator ill iusert her answering plugr 2l into one ol the jauksll unil depress her listening-key 2l) to learn the. wishes of the cullingt party.

The insertion of the plugr i4 will complete u seeontl path for current from the. live pole ot the buttery 1Q, through winding 13 of the, repeating eoil in parallel to that through the impl-laure 2l, line lamp fill, uml relu;Y contar-ts lt-a -ll5. This ,with includes they impellenel.: 2S, supervisor); lump T strand 22, plug` 34. and juek 14. The. elosingof this path in .shunt to the lineY lmnp ltl will, h3' reuson of the u iuiliugA 11%. prevent sulicient eurrenty from lowins;r through the lamp 27 to muse its illuiniinition. At this time, hoth linups 121) und 2T ill, therefore. remain darli. Upon depressing the listening-key 2E), the operators talking eirifuit, through the seconilury 'whirling of the iinluetion eoil 232, will extend from ground :it Suid coil through sfiitl secondary winding, the. operutor'sre.- eeiver 31, the. Condenser 3l), ringing-key 29, eonilenser 26, strand 122, plug 24, jack 14l repeating coil winding 13 to ground. This. eireuit, being induetively related to the suhserihers eircuit over the line linihs 3 4, will enzihle conversation to he lreltl lietwieen the operator und the subscriber eonneotefl with .said line. ljpoo` learning the wishes of the vulling; party, the operator will then toueh the tip Contact of the culling plug '.25 against the testing cont-net nl one of the juelis 14 to determine the idle or busy conl lition of tho line T T'. lf siil line is lt-tsy, there will he a p'otentizil :it the test Contact ol" the i:u'k uliove timl. of ground hy reason ofi the eouixeetion of one of the, multiple juf-ks with the live polo of me buttery 1".) through the eonneet'e'l linlt-eireuitA :it .another oper- :itors position. Under such condi:y ions, ille x zugement of the lip Contact of the plug '25 with the testingrontiietfol' the hielt will enlise "iuiieutury llow of i'nrreiit through the ry \ii.tliu1ofth"iniiietioneoilllf nml Eurit. "elli-lt" in iii-e operators revolver. us au indication to her that. the line i. Y.' li the line is l` unil iclle, the operator will in ert tht-'pit l5 into the joel( 1l nml fleuress her rir.,\i -l-;ejc 35 to close 21 eireuit .li-mo. the live pole of the, milling generator nl through the. lump 35?, ringing-key tzu ...S il i, 13,plug 3.3, jui-li l .unl repeateoi'l rsfiv winding 125' 'to ground. The sage of alternating current over this eireuit. will irnluee a similar (.-urrent flow over the line lirolis 3-4 to aetuate the eall-hell 1 :it suhstation B. Upon the insertion of the plug 2.3 into the joel( ll", the circuit will be completed from the live pole of the battery 19, through impedance. 2S', supervisory lamp 2T", .-:trrtnd 23, plug 25, jack 14', and the ne to ground by two puths-one through the relay windingT 13 and the other by way of relay Contacts 15V-17 and imlpednnce 1S. By reason of the. relatively lowv resistance of this latter brune i, enough euri'eutwill flow through superxismjv lump 2T" to cause its illumination. lt vill remain thus illuminated until the call at substation B is answers-l by the removal of the reeei'ver from its switch-hook 5. This latter act will close a. circuit through high potential hziltery l2 and the winding 1l' of the repeating coil relay R to cause the separation of the relay contact-s l6-17 and the engagementof the former with the elternate Contact 18B. "l his will break the branch including the lov.' resistance of the. impedance anfl leave the circuit of the supervisory. lmnp 27 completed only through the Swinding 13 in parallel 'Lo the. linel lamp 2U. As previously indicated, this will cause the extinguishment of both line and supervisory lumps. Vl'ith the parties thus connected, the supervisory lamps -27-27 will remain extinguished until, at. the end of conversation, the receivers 10-10' are hung up. As soon as this takes place, the armature con 'mets of the repeating coil relays will return to their normal position, thereby interrupt-A ing' the circuit of the line lamps and 'causing the. illu. .l..ation of the supervisory lmnps, as :in indication ,to the operator to disconnect.

ln the form of the invention illustrated in Fig. 2, a somewhat differenty circuit arrangement. is employed in the control of the line und supervisory lumps. In this ense, the high potential battery 12a is connected m series 'with the. sections of the Winding l l of the repeating coil relai as in Fig. l, and the other winding is similarly conneeleil to the line L') jacks 14. but the Conner-tion of the latter to ground is norn'mlli' by wir): of the normally closed contact-s '-Owll unil, when sind con- Cil - :mold intel-creme with speech trans- 's ere sepnrelcd. hv way ol the winding of cut-ell rein'.

ed to #he high potential butler? E28 's circuit is provided nifl; two breuk if-.fios --ofse cmtrolled hy the repeating evil 'nets lm-45, :1nd ille other ily the ent-oil' eifel contacts' -l6--47- In other respects, he system is substantially the sante als that disclosul in Fig. l. l

ln the operation of this system,Y the rc- .fnovnl of the switch-hook ut the substation, in order :o inni-.de u call. suppliecurrent to the repeating coil relay infung l from the hutte Zf to canse said relay to attract its armi# 'e contacts 10 and 45-hy the former, to in fidi the normal connection from the repczztng coil relay winding 13 to ground, nodig. the latter, to close the circuit of the line lump 2t to cause its illumination. -In imswering u call, the insertion ofthe plug 24 into the livel; 1 4 completes n circuit fot-.the supervisory lmnp 27 from the live pole of the huw y NI, through the impedance 2S, suficr: f lamp E?, plug 2-1 jack'M, `repeatay winding 12S, winding of the Cnt- 2, to ground. ly reason of the rcsirtance ol this circuit due to the inclusion of the winding of the :nt-oli' relay 42, the current lion' through the supervisory lamp 27 is ent te canse its illumination. vThis cnrz'enz lloc'. however, is sufficient t0 Cause the cut-oli '.cliiy -12 to separate its contacts lo-4T. thereby to extinguish the line lmnp ffl. ln the :ict of calling a subscriber, the insertion ot' .he plug 24 into the jack cluses a ci cuit for the .su )ervisory lamp 22" similar io thu-f llust tmcetl, 'ontv connecting to ground by way of the repeating coil relay contacts 4t) und -tt instead of hy way of the cut-ofi' relay winding 42. This direct. ground allows sulficient current to llow through the supervisory lnnfp to canse its display. Its extinguishment i brought about by the subsequent answering of the subscriber, which causes a st-parution ol' the relay contacts 40 and 41. thereby including the winding -of the cut-oil' relay 42 in circuit with the supervisory' lamp und causing its extinguislunent. v

in both forms' of the invention, the arrangement is .such that, :it no time, can the opernror cause :i change in the normal condition of ihe'repentmg coil relay contacts, nor een she hold the relay armatures Rttracted. ln other "words, the movements of thenrmatures' of these relays :ire'under the sole control o f the suhscribeis.

Ohyonsly, certain modifications and altermitms ,muy be nmde in the matter herein di-cfscd without departin'.' from the. spint. and scope of my invention. For example, the wu'mus connections to ground may be inno te :t connnon ollice return; the hat,-

lnne lmnp 2i. this instance is g tcries shown separately muy he one and the same :1. d the low potential connections made at snitnhle points. Likewise. in other instances. ohmie resistance inn he used in-.

stond of the impednnces il.usti'ated. l,

the terms o the claims the various possible Variations and combinations.

What, l claim as new, und desire to secure hy Letters latent of the lfnited States is 1. A telephone systen, comprising :l telelphone line extending from a substation to a 33 -central oilce, a connection terminal for sind line, a repeating coil relay controlled solely 'by the subscriber having windings inductively uniting said line tosnid terminal. n linkcircuit formaking connection to said terminal to establish a conversational circuit, a resistance condnctivelv ussociated with sind termina-l, an electricallv actuated signal and connections with said repeating coil relay contacts und said resistance wheiehy snid resistance is utilized in the control of said signal. i 2. A telephone system comprising n telephone line extending from a substation to n. central ofiice, a connection terminal for said line, a repenting coil relay controlled solely by the subscriber having windings inductively uniting said line to said terminal, n link-circuit for making connection to :said terminal to establish :i conversational circuit, a resistance conductirelv associated with said terminal, an electrically actuated signel associated with said link-circuit. and connections with said repeating coil relay contacts and said resistance wherel said resistance is utilized in the control of said signal.

3. A .telephone system comprising n plurality of lines extending from snlxstntions to a central otliec, connection termiimls l'or said lines, repeating goil relays controlled solely by the subscribers having windings inductively uniting each line tons terminal, n linkcircuit for completing/a connecting circuit between :mv two tele/phone lines, :1 resistance oondvctively associated with said terminal, 11.5

an electrically actuated signal connected to the link-circuitin bridge of the talking circuit, and connections wit h snid repent ing coil relay-contacts and said resistance wherein s'aid resistance is utilized in the control said signal.

4. A telephone system comprising n plurality of lines extending from suhstutions to n central office, connection terminals for said lines. repeating coil relays controlled solely by the subscribers having windings uninet- 'ely uniting each line to its terminal. n linkclrcuit for completing a conhoct-ing circuit.

between am' two telephone lines, a resistance cornluctiveljv associated with each terminal, 13e,

an electrically actuated signal connected to l link-circuit for making connection to. said the link-circuit in bridge of the. talking c'irterminal to establish a conversational circuit.. 52nd means l'or cutting said resistance cuit, means for energizing said relav to cause into :1nd out of circuit ith said signal to a movement of its armature, an electrically cause thc ellaccment and display of the latter y actuated line signal having its energizing cir- 7@ according to tbe oper.- tiye positions of the cuitl closed 1n response to such movementt repeating coil relay contacts. means under the control of the operator for A telephone system comprising a telel llacing said signal by interrupting its encrpbonc line extending from a .substation to u i gizing circuit.

cen ral ollicc, a connection terminal for said l 9. A telephone system comprising-j a tcle- 7;

line, e. repeating coil relay having windings phone line extending from a substation to a indue' iwely uniting said lim` to said terminal` central ollicc, a. connection terminal for said a link-circuit for making connection to said line7 a` repeating coil relay solely controlled terminal to cstablisha conversational circuit, by thc subscriber haying windings inductarcsisttniceconductivelvassociatedwith said ivcly uniting said line to said terminai, a L ttiminai, an electrically actuated signal, link-circuit for making comiection to said means normally operative upon tbl` connccterminal to establish a conversational circuit, tion ol' said link-circuit to said' terminal to means for energizing said relay to cause a supply current over a circuit through one of Inovenient of its armature by completing a 2; the repeating coil windings to cause the actucircuit through one ot the repeating coil re- 35 ation otsaid signal, and means actuated by lay windings, a signal displayed in response. said repeating coil relay contacts under the. t0 such armature movement, and means uncontrol of the subscriber to include said reder the control cf the operator for elim-ing sistance in said circuit to reduce the current said signal .by closing a circuit through the flow therein sufficiently to return said signal other repeating coil relay winding. to n:)rmal. 1U. A telephone system comprising a tele 6. A telephoney system comprising a telc.- phone line extending from a substation. to a phone line extending from a substation to a central oilice, a connection terminal therecentral ottice, a connection terminal for said for, a repeating coil relay buying windings line, a rc )eating coil relny baring windings inductiyely uniting said line to said terminal, inductively uniting said line to said terminal, a link-circuit for making comicction to said a link-circuit for making connection to said terminal to establish a conversational circuit, terminal to establish a conversational circuit, a line signal normally displayed upon the clomcans for energizing saidrepeating coil relay sure of the contacts of said relay, means unto cause amoyement of the relay armature der the control of tbe subscriber for closing a from its normal position, said roof-'ement becircuit over the telephone line. and through ing under the sole control of the subscriber an one of the repeating coil relay windings to electrically actuated signal buying its circuit closel the relay contacts, the. movement of normally closed at one point upon tbe movcsaid contacts being under tbe sole control of meut. of said relay armature, and means o ithe subscriber. anclectricallyactuated signal erative upon the connection of the said linltassociated with the link-circuit, moans operacircuittosaid tcrmiualto interrupt the circuit ti e upon the connection by the operator ot' of said signal at another point. said link-circuit to said terminal to supply 7. A telephone system comprising a telccurrent over a circuit including the other rephonc line extending from n substation to a )eating coil relay winding nornmlly to cause 31") central office7 a connection terminal for said the display of said link-circuit signal, a relinc, n repeating coil relay having windings sist-ance. conductively associated with said inductively uniting said line to said terminal, terminal, means operated by the. closing of a link-circuit l'or making connection to said tho subscribers circuit to utilixe said resistterminal to establish a conversational circuit, ancel to place tbc. display of said link-circuit an electrically actuated line signal having its signal beyond the control ol' the operator, energizing circuitl controlled by the rclayconand meanswperated by tbc closingol' the optarts, nti-:ins forcuergizingsaid relay tocause I crator's circuit lo place the. display of the a change iu the normal relative position olits line. signal beyord the control of the. subcontacts,said contacts beiuflsolelycontrolled scriber. 120 by the subscriber and means operative upon ll. A telephone system comprising a teletlrc connection ol` said link-circuitI to said terphone line extending from a substation to a minal to interrupt the circuit of said liuc central ollice, a connection terminal for said Sllml. v line, a repeating coil relay solely controlled S. A telephone system comprising a teleby tbc subscriber having windings induct- 12 phono lino extending from a substation to a ively uniting said lim` to said terminal, a central ollicc` a connect ion terminal l'or said link-circuit for making connection to said line. :t repeating coil `relay solely controlled terminal to establish a conversational circ-fit, by tbc subscribor having nimlings inducla line. .signal controlled by tbe. relav contacts. ively uniting said line lo said terminal, .a means under thcY control ofthe subscriber to vcialcd with said terminal, and moans under thc control of the subscriber for .nllacing said signal by including said resistance in said circuit.

il?. A telephone sys'tr-ni comprising a telephone lineextending from a substation to a central otlice, a repeating coil connected therewith, means for holding conversation over said line Through the agency of said rcpeating coil, a signal lamp in a normally opcn circuit with one ot the repeating coil Windings. a signal lamp in :i sec-ond normallyopen,

circuit, a relay having its winding included in the former circuit and its contacts iii-the latter. means for normally short circuiting the winding of said relay, means for closing thc former circuit normally through the short circuit to light thc former signal lamp and abnormally through the relay winding to cause thc rclay'to break the latter circuit', and means for removing the short circuit to increase the resistance o the. former circuitto prcent the. lighting of its lamp and for imrinally closing thc latter circuit to light its lamp.

13. A telephone system comprising a telephone. liuc. cxtcnding from a substation to a central pillo-e, a repeating coil comiccted thcrewith, means for holding conversation over said line through the agency of said rcpcaiing coil, a. signal lamp in a normally open circuit with one of the repeating coil windings, a signal lamp in a second normally open circuit, a relay haring its winding included in the former circuit und its cont-acts in the y, latter, lmoans for normally short circuiting the winding of said relay, means under the control of the subscriber for closing the former circuit normally through the .short circuit to light the former signal lamp and?,- ubnormalljf' through the relav winding tpl cause said relay to hi'cnk the lutter circuh-Y anil means mitici' thc control ofthe Suiscribe-r for removing thcshort circuit. to 'nr g uuid short circuit to increase .the resistance of crease the resistance ol' the forincr circuiht' prevent the lighting of its lamp and for normally closing the lattor circuit to light its lump.

14. A telephone system comprising a telephone line cxtcnding from a substation to a central ollicc, a connection terminal for said line., a repeating coil for inductively uniting said line to said terminal, a linkcircuit and connecting plug for making connection to said terminal, means for holding conversation over said line and link-circuit, u super-- visory lamp in a normally opi-.n circuit with one of the repeatingr 'coil windings, a linol lain in a second normally o en circuit, a h:- lay aving its winding inclu( .-d in the former circuit and its contacts in ilic latter, means for normally snort. circuiting the winding of said relay, means operative upon thc connection of said plug to said terminal to closo the former circuit normally through tho short circuit to light the supwfrvisor'y lamp :uid :ili-` normally through the relay winding to cause. said relay to 'ort-.ak the line lamp circuit, und means under the control of the subscriber for removing the short circuit to-incrciise thc resistance ci the superviiory lamp circuit. to prevent the lighting of the supervisory` lmnp and for normally closing the linc lamp circuiit to light the, line lamp.-

15. A telephone syste-m comprisingl a telcphonc linel extending from a substation to a central office, a repeating coil connected therewith, means for holding conversation over said line through the agency of Suid repeating coil, a resistance, a signal lamp included in a normally open circuit. with .said resistance and one of the repeating coil windings, a normal short circuit about said rc- .si tance, a sec-ond signal lamp included in .a scf-ond normally open circuit, means for normally closing Said former circuit through said short. circuit to light the included lamp, and a single set of contacts normally,v ope-ru.- tivc'to close .said second circ-uit to light its lamp and to remove said' short circuit to increase the resistance of the, tiist lamp circuit to prevent the lighting of its lamp.

16. A telephone system comprising a telephone line extending lfrom a substation to a central milice, a repeating coil connected therewith, moana for holding convcisation over said line through the agency of said reposting coil, a resistancer a signal lamp in- 'cluded in a normally open circuit with said resistance and one ol the repeating coil windings, a normal short circuit about said resistancc, a second signal lamp included in a. second normally open circuit, means under the controlof the operator for normally closing said former circuit through said short circuit tolight thc included lamp, and a sinlgle set of contacts under the control of the subscriber for normally closing said second circuit -to light its lamp mid for removing the lirst lainp circuit to prevjent the lighting of its lamp. v

17. A telephone system comprising a telcphone line extending from asuhst-ation to a. central ollice, a. connection terminal for said lino, a repcati v coil for inductixcly uniti said lino to saiil terminal, a link-circuit an( connecting lug for making connection to said terminal), means for holdmg conversation over said line and link-circuit, a r xshitancc. a supervisory lamp included in n. normally open circuit with said resistance and one of thc repeating coil windings, a normalshort crcut ahum said xosistzmc, a line lmnp in .suini shur Circui in ncreasc the resshmceof 10 vindt-d in :L Second normally @pun crcui. mpfrvisorj: lamp circuit to prevent the menus opmntivc upon the Connection uf mf I uf its hmm, plug tu #uid lwmlm to @inw du cuit nnmmll hrmxgth Hw .Jhon f uil i;y light thu slzpwviwrj: lamp, and i suw'w ist.

of mmmvts univr thv. comm! if Hw mbl x PS: scnbcr for xmrmaly unsung sand snwmf vaz'- il. lh'sox. fuit tu lxglt the imc lump am fm* ronmvmg GEO. L, Blub ,LEM 

